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Finding the Fourth Proportional to 20,620.99, 28,469.19 and 13,559.59

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Solution

The fourth proportional to 20,620.99, 28,469.19 and 13,559.59 is: 18,720.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.99 : 28,469.19 = 13,559.59 : x
  2. Step 2: Convert to fraction form
    20,620.99/28,469.19 = 13,559.59/x
  3. Step 3: Cross multiply
    20,620.99x = 28,469.19 × 13,559.59
  4. Step 4: Simplify right side
    20,620.99x = 386,030,544.03
  5. Step 5: Solve for x
    x = 386,030,544.03/20,620.99
  6. Step 6: Final answer
    x = 18,720.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.